Based on the forum post found here, it seems that ARM is not compatible at the moment. It is also worth noting the mac minis do not have upgradeable storage or multiple drives and two drives are listed as an additional requirement.
Minimum Hardware Requirements:
x86 compatible hardware (Intel or AMD)
(HexOS is NOT ARM or RISC-V compatible)
64 bit Processor with 2+ cores
8GB or more of system memory
16GB or larger boot SSD
3 or more storage drives recommended
Minimum of two drives. (Pool will not be expandable if using only 2 drives)
Please visit https://hexos.com/early-access-faq: for more info
